微信小程序授权获取手机号
1、先调用wx.login()，获取到code，code为用户登录凭证（有效期五分钟）；
2、点击授权获取手机号；
<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber"></button>
getPhoneNumber (e) {
console.log(e.detail.iv)
console.log(e.detail.encryptedData)
}3、将code、iv、encryptedData传给后台解析获取手机号4、后台接口实现如下，使用nodejs
const rp = require('request-promise');
const crypto = require('crypto');
async function getSessionKey(code) {//通过code获取 OpenID 和 session_key
try {
let options = {
method: 'GET',
url: 'https://api.weixin.qq.com/sns/jscode2session',
qs: {
grant_type: 'authorization_code',
js_code: code,
secret: "小程序密钥",
appid: "小程序appid"
}
};
let sessionData = await rp(options);
sessionData = JSON.parse(sessionData);
if (sessionData.session_key) {
return sessionData.session_key;
}
} catch (e) {
return null;
}
}
async function getPhone(code, iv, encryptedData) {//通过code, iv, encryptedData解密手机号
let session_key = await getSessionKey(code);
let sessionKey = Buffer.from(session_key, 'base64');
encryptedData = Buffer.from(encryptedData, 'base64');
iv = Buffer.from(iv, 'base64');
let decoded;
try {
var decipher = crypto.createDecipheriv('aes-128-cbc', sessionKey, iv);// 解密
decipher.setAutoPadding(true);// 设置自动 padding 为 true，删除填充补位
decoded = decipher.update(encryptedData, 'binary', 'utf8');
decoded += decipher.final('utf8');
decoded = JSON.parse(decoded);
} catch (err) {
throw new Error('Illegal Buffer');
}
if (decoded.watermark.appid !== "小程序appid") {//替换为真实appid
throw new Error('appid错误');
}
return decoded;
}